/*_############################################################################
  _## 
  _##  SNMP4J 2 - Log4jLogAdapter.java  
  _## 
  _##  Copyright (C) 2003-2011  Frank Fock and Jochen Katz (SNMP4J.org)
  _##  
  _##  Licensed under the Apache License, Version 2.0 (the "License");
  _##  you may not use this file except in compliance with the License.
  _##  You may obtain a copy of the License at
  _##  
  _##      http://www.apache.org/licenses/LICENSE-2.0
  _##  
  _##  Unless required by applicable law or agreed to in writing, software
  _##  distributed under the License is distributed on an "AS IS" BASIS,
  _##  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  _##  See the License for the specific language governing permissions and
  _##  limitations under the License.
  _##  
  _##########################################################################*/
package org.snmp4j.log;

import org.apache.log4j.*;

import java.io.Serializable;
import java.util.Iterator;
import java.util.logging.Handler;

import org.snmp4j.util.EnumerationIterator;

/**
 * The <code>Log4jLogAdapter</code> implements a logging adapter for Log4J.
 *
 * @author Frank Fock
 * @version 1.10
 * @since 1.2.1
 */
public class Log4jLogAdapter implements LogAdapter, Comparable {

    private final Logger logger;
    private final static String FQCN = Log4jLogAdapter.class.getName();

    /**
     * Creates a Log4J log adapter from a Log4J Logger.
     * @param logger
     *    the Log4J Logger to use with this adapter.
     * @since 1.2.1
     */
    public Log4jLogAdapter(Logger logger) {
        this.logger = logger;
    }

    /**
     * Logs a debug message.
     *
     * @param message the message to log.
     */
    public void debug(Serializable message) {
        logger.log(FQCN, Level.DEBUG, message, null);
    }

    /**
     * Logs an error message.
     *
     * @param message the message to log.
     */
    public void error(Serializable message) {
        logger.log(FQCN, Level.ERROR, message, null);
    }

    /**
     * Logs an error message.
     *
     * @param message the message to log.
     * @param throwable the exception that caused to error.
     */
    public void error(CharSequence message, Throwable throwable) {
        logger.log(FQCN, Level.ERROR, message, throwable);
    }

    /**
     * Logs an informational message.
     *
     * @param message the message to log.
     */
    public void info(CharSequence message) {
        logger.log(FQCN, Level.INFO, message, null);
    }

    /**
     * Checks whether DEBUG level logging is activated for this log adapter.
     *
     * @return <code>true</code> if logging is enabled or <code>false</code>
     *   otherwise.
     */
    public boolean isDebugEnabled() {
        return logger.isDebugEnabled();
    }

    /**
     * Checks whether INFO level logging is activated for this log adapter.
     *
     * @return <code>true</code> if logging is enabled or <code>false</code>
     *   otherwise.
     */
    public boolean isInfoEnabled() {
        return logger.isInfoEnabled();
    }

    /**
     * Checks whether WARN level logging is activated for this log adapter.
     *
     * @return <code>true</code> if logging is enabled or <code>false</code>
     *   otherwise.
     */
    public boolean isWarnEnabled() {
        return logger.isEnabledFor(Level.WARN);
    }

    /**
     * Logs an warning message.
     *
     * @param message the message to log.
     */
    public void warn(Serializable message) {
        logger.log(FQCN, Level.WARN, message, null);
    }

    public void fatal(Object message) {
        logger.log(FQCN, Level.FATAL, message, null);
    }

    public void fatal(CharSequence message, Throwable throwable) {
        logger.log(FQCN, Level.FATAL, message, throwable);
    }

    public void setLogLevel(LogLevel level) {
        Level l;
        switch (level.getLevel()) {
            case LogLevel.LEVEL_OFF:
                l = Level.OFF;
                break;
            case LogLevel.LEVEL_ALL:
                l = Level.ALL;
                break;
            case LogLevel.LEVEL_TRACE:
                l = Level.DEBUG;
                break;
            case LogLevel.LEVEL_DEBUG:
                l = Level.DEBUG;
                break;
            case LogLevel.LEVEL_INFO:
                l = Level.INFO;
                break;
            case LogLevel.LEVEL_WARN:
                l = Level.WARN;
                break;
            case LogLevel.LEVEL_ERROR:
                l = Level.ERROR;
                break;
            case LogLevel.LEVEL_FATAL:
                l = Level.FATAL;
                break;
            default:
                l = null;
        }
        logger.setLevel(l);
    }

    public Logger getLogger() {
        return logger;
    }

    public String getName() {
        return logger.getName();
    }

    public LogLevel getLogLevel() {
        Level l = logger.getLevel();
        return toLogLevel(l);
    }

    private LogLevel toLogLevel(Level l) {
        if (l == null) {
            return LogLevel.NONE;
        }
        switch (l.toInt()) {
            case Level.OFF_INT:
                return LogLevel.OFF;
            case Level.ALL_INT:
                return LogLevel.ALL;
            case Level.DEBUG_INT:
                return LogLevel.DEBUG;
            case Level.INFO_INT:
                return LogLevel.INFO;
            case Level.WARN_INT:
                return LogLevel.WARN;
            case Level.ERROR_INT:
                return LogLevel.ERROR;
            case Level.FATAL_INT:
                return LogLevel.FATAL;
        }
        return LogLevel.DEBUG;
    }

    public int compareTo(Object o) {
        return getName().compareTo(((Log4jLogAdapter) o).getName());
    }

    public LogLevel getEffectiveLogLevel() {
        Level l = logger.getEffectiveLevel();
        return toLogLevel(l);
    }

    public Iterator<Appender> getLogHandler() {
        return new EnumerationIterator<Appender>(logger.getAllAppenders());
    }
}
